利用直流电沉积方法将WC-Co双纳米颗粒和Ni复合镀于黄铜基体, 采用XRD和SEM表征复合镀层相组成和表面形貌, 用显微硬度计测定其硬度并用电化学方法评估镀层的耐蚀性. 结果表明, 与纯Ni镀层相比, 纳米复合镀层中Ni平均晶粒尺寸略有降低, 约为18 nm; 显微硬度提高58%, 约为HV 500. 在3.5% NaCl溶液中纯Ni镀层自腐蚀电流密度和自腐蚀电位分别为1.467 μA/cm2和-0.179 V, 纳米复合镀层则分别为8.369 μA/cm2和-0.265 V. Ni/WC-Co纳米复合镀层的硬度显著提高, 但其耐蚀性降低.
The nanocomposite Ni/WC-Co coating was prepared by DC electrodeposition of Ni with WC-Co nano-particles on brass. The phase constituent and surface morphology of the coating were characterized by XRD and SEM. The microhardness of the coating was measured by using microhardness tester. The corrosion behavior of the coating in 3.5% NaCl solution was investigated by using electrochemical methods. Compared to pure nanocrystalline Ni coating, the average grain size of Ni in nanocomposite Ni/WC-Co coating was slightly finer, which was about 18 nm; the microhardness of the nanocomposite coating was 58% higher, reaching about HV 500. The corrosion current density and corrosion potential of the nanocomposite coating in 3.5% NaCl solution were 8.369 μA/cm2 and -0.265 V, respectively, as a contrast with those of 1.467 μA/cm2 and -0.179 V for pure nanocrytalline Ni coating. It concluded that the microhardness of the nanocomposite coating was enhanced significantly, but the corrosion resistance in 3.5% NaCl solution decreased as compared with pure nanocrystalline Ni coating.
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